A substance changes state from solid to liquid by absorbing 12000 J of energy. If the mass of the substance is 3 kg, what is the specific latent heat of fusion (Changes of state and specific latent heat)

The correct answer is 4000 J/kg.

Practical lens: Link apparatus, readings, and uncertainty to the exact measurement named in the objective. This question asks: A substance changes state from solid to liquid by absorbing 12000 J of energy. If the mass of the substance is 3 kg, what is the specific latent heat of fusion (Changes of state and specific latent heat). The correct response is 4000 J/kg, because density links mass and volume, so the answer must preserve which quantity is being calculated. In Changes of state and specific latent heat, the marking point should connect directly to calculate specific latent heat when energy transferred and mass are known. If the question includes values, the working must keep the appropriate unit and operation; if it is an explanation, it must name the relevant particle behaviour or energy change. This item belongs to Internal energy and energy transfers, so avoid answers that switch to a different quantity, confuse heat with temperature, or describe gas pressure without collisions when collisions are the reason. Checkpoint 410 is distinct because it uses this exact question context and the practical lens rather than a generic particle-model sentence.